loader/phys_dev_chain_masm.asm - third_party/VulkanTools - Git at Google

 ;
 ; Copyright (c) 2017 The Khronos Group Inc.
 ; Copyright (c) 2017 Valve Corporation
 ; Copyright (c) 2017 LunarG, Inc.
 ;
 ; Licensed under the Apache License, Version 2.0 (the "License");
 ; you may not use this file except in compliance with the License.
 ; You may obtain a copy of the License at
 ;
 ;     http://www.apache.org/licenses/LICENSE-2.0
 ;
 ; Unless required by applicable law or agreed to in writing, software
 ; distributed under the License is distributed on an "AS IS" BASIS,
 ; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 ; See the License for the specific language governing permissions and
 ; limitations under the License.
 ;
 ; Author: Lenny Komow <lenny@lunarg.com>
 ;

 ; This code is used to pass on physical device extensions through the call chain. It must do this without creating a stack frame,
 ; because the actual parameters of the call are not known. Since the first parameter is known to be a VkPhysicalDevice, it can
 ; unwrap the physical device, overwriting the wrapped device, and then jump to the next function in the call chain

 ; PHYS_DEV_DISP_OFFSET is defined in codegen
 INCLUDE gen_defines.asm

 ; 64-bit values and macro
 IFDEF rax

 PHYS_DEV_SIZE           equ 8
 PHYS_DEV_UNWRAP_OFFSET  equ 16
 PTR_SIZE                equ 8

 PhysDevExtTramp macro num:req
 public vkPhysDevExtTramp&num&
 vkPhysDevExtTramp&num&:
     mov     rax, qword ptr [rcx]                            ; Dereference the wrapped VkPhysicalDevice to get the dispatch table in rax
     mov     rcx, qword ptr [rcx + PHYS_DEV_UNWRAP_OFFSET]   ; Load the unwrapped VkPhysicalDevice into rcx
     jmp     qword ptr [rax + (PHYS_DEV_DISP_OFFSET + (PTR_SIZE * num))] ; Jump to the next function in the chain, preserving the args in other registers
 endm

 ; 32-bit values and macro
 ELSE

 PHYS_DEV_SIZE           equ 4
 PHYS_DEV_UNWRAP_OFFSET  equ 8
 PTR_SIZE                equ 4

 PhysDevExtTramp macro num
 public _vkPhysDevExtTramp&num&@4
 _vkPhysDevExtTramp&num&@4:
     mov     eax, dword ptr [esp + PHYS_DEV_SIZE]            ; Load the wrapped VkPhysicalDevice into eax
     mov     ecx, [eax + PHYS_DEV_UNWRAP_OFFSET]             ; Load the unwrapped VkPhysicalDevice into ecx
     mov     [esp + PHYS_DEV_SIZE], ecx                      ; Overwrite the wrapped VkPhysicalDevice with the unwrapped one (on the stack)
     mov     eax, [eax]                                      ; Dereference the wrapped VkPhysicalDevice to get the dispatch table in eax
     jmp     dword ptr [eax + (PHYS_DEV_DISP_OFFSET + (PTR_SIZE * num))] ; Jump to the next function in the chain, preserving the args on the stack
 endm

 ; This is also needed for 32-bit only
 .model flat

 ENDIF

 .code

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 end
	;
	; Copyright (c) 2017 The Khronos Group Inc.
	; Copyright (c) 2017 Valve Corporation
	; Copyright (c) 2017 LunarG, Inc.
	;
	; Licensed under the Apache License, Version 2.0 (the "License");
	; you may not use this file except in compliance with the License.
	; You may obtain a copy of the License at
	;
	; http://www.apache.org/licenses/LICENSE-2.0
	;
	; Unless required by applicable law or agreed to in writing, software
	; distributed under the License is distributed on an "AS IS" BASIS,
	; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	; See the License for the specific language governing permissions and
	; limitations under the License.
	;
	; Author: Lenny Komow <lenny@lunarg.com>
	;

	; This code is used to pass on physical device extensions through the call chain. It must do this without creating a stack frame,
	; because the actual parameters of the call are not known. Since the first parameter is known to be a VkPhysicalDevice, it can
	; unwrap the physical device, overwriting the wrapped device, and then jump to the next function in the call chain

	; PHYS_DEV_DISP_OFFSET is defined in codegen
	INCLUDE gen_defines.asm

	; 64-bit values and macro
	IFDEF rax

	PHYS_DEV_SIZE equ 8
	PHYS_DEV_UNWRAP_OFFSET equ 16
	PTR_SIZE equ 8

	PhysDevExtTramp macro num:req
	public vkPhysDevExtTramp&num&
	vkPhysDevExtTramp&num&:
	mov rax, qword ptr [rcx] ; Dereference the wrapped VkPhysicalDevice to get the dispatch table in rax
	mov rcx, qword ptr [rcx + PHYS_DEV_UNWRAP_OFFSET] ; Load the unwrapped VkPhysicalDevice into rcx
	jmp qword ptr [rax + (PHYS_DEV_DISP_OFFSET + (PTR_SIZE * num))] ; Jump to the next function in the chain, preserving the args in other registers
	endm

	; 32-bit values and macro
	ELSE

	PHYS_DEV_SIZE equ 4
	PHYS_DEV_UNWRAP_OFFSET equ 8
	PTR_SIZE equ 4

	PhysDevExtTramp macro num
	public _vkPhysDevExtTramp&num&@4
	_vkPhysDevExtTramp&num&@4:
	mov eax, dword ptr [esp + PHYS_DEV_SIZE] ; Load the wrapped VkPhysicalDevice into eax
	mov ecx, [eax + PHYS_DEV_UNWRAP_OFFSET] ; Load the unwrapped VkPhysicalDevice into ecx
	mov [esp + PHYS_DEV_SIZE], ecx ; Overwrite the wrapped VkPhysicalDevice with the unwrapped one (on the stack)
	mov eax, [eax] ; Dereference the wrapped VkPhysicalDevice to get the dispatch table in eax
	jmp dword ptr [eax + (PHYS_DEV_DISP_OFFSET + (PTR_SIZE * num))] ; Jump to the next function in the chain, preserving the args on the stack
	endm

	; This is also needed for 32-bit only
	.model flat

	ENDIF

	.code

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	end